Lubricant compressor



Sept. 18, 1928.

E. W. DAVIS LUBRICANT COMPRESSOR Filed May 5, 1924 RN QN .uN

Patented Sept. 18, 1928.

UNITED STATES y, 1,684,946 PATENT orricrf.

ERNEST W. DAVIS, OF OAK PARK, ILLINOIS, ASSIGNOR TO THE BASSICK MANUFAC- TURING COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF -IDFJIAIA'WAR'E,

LUBRIGANT COMPRESSOR.

Application mea may s, 1924. serial No. 710,775.

A My invention relates to improvements in lubricant compressors, and isy particularly concerned with the provision of a novel type of compressor for supplying lubricant under high pressure to bearings to be lubricated. he objects of my present invention are:

First, to rovide a compressor, of the character descri ed, which is particularly adapted, though not limited, to be used as a part of 10 a system Comprising a plurality of fittings,

one of which is secured to each of the bearings to be lubricated, and a compressor for supplying lubricant thereto, the compressor embodying means for making sealed connection with the lubricant receiving fittings.

Second, to provide a lubricant compressor, comprising a barrel, or low pressure cylinder, for holding a supply of lubricant and a high pressure cylinder communicating. therewith, in combination with means for displacing the lubricant from the high pressure cylinder into, the fittings.

Third, to provide a lubricant compressor,

of the character described, in which means ai'e provided for insuring successive charges of lubricant being forced from the barrel into the high pressure Cylinder. c

Fourth, to provide a compressor, such as described, in which a single spring effects. the discharge of lubricant from the barrel` into the cylinder, and also moves the high pressure cylinder to its charging position.

Fifth, to provide a compressor, such as described, in which the high pressure cylinder, under the action of the spring mentioned in the preceding object, acts as an indicating means for indicating to the operator that the means for charging the high pressure cylinder are in operative condition.

40 Sixth, to provide a compressor,'such as described, certain parts of which can be made by metall drawing processes; and l Seventh, to provide a compressor, of the character described, which is simple in construction, economical to manufacture and easy to operate.

Other objects^of my invention will appear as this description progresses, reference being had tothe accompanying drawings, in which Figure 1 isa central, longitudinal section thinugh one embodimentoi;` my invention; an l Figure 2 is a sectional detail of a modiied form of my invention.

Referring, fdr the present, to Figure 1, my improved compressor comprises the barrel, or low pressure cylinder 5, which is provided at its open end with the removable closure.` 6,

secured thereto by a-threaded connection 7, or 11i any other desired manner. The cap 6 is provided with a hollow tubular'handle 8, having tongues 9 formed at 'its inner end and prefgrably spot welded to the side of the\ cap Y A pistonrod 10 is reciprocably mounted in a suitable opening in the end or' the cap 6 and is provided at its outer end with a suitable handle 11, by which the same can be rotated. The inner end of the piston rod 10 is screwtlrreaded, as shown at 12, this thread, preferably, though not necessarily, bein a left-hand thread. A collar or stop mem er- 13 is secured to the piston rod 10, where the threaded and unthreaded portions of this rod meet, and a disk 111 is mounted upon the unthreaded portion of the rod and abuts against the collar 13. A compression spring 15 is` confined between the collar`13 and the end of the cap 6 andtends to hold the piston rod 12 in its innermost position. f

I provide apiston l? for contacting with the lubricant in the barrel 5 and constantly maintaining a pressure thereupon, tending to force it into the high pressure cylinder about to be described. This piston comprises the nut or sleeve 16, which is threaded upon thev piston rod 12, the face plate 17, the cup leather 18 and the follower plate 19, all of which are cent-rally apertured to receive the vsleeve or nut 16. A second nut 20, threaded upon the outer end of the sleeve 16, clamps the face plate 17, cup leather 18 and follower plate 19 between itself and the Harige 16 on the sleeve 16, thereby holding these parts in assembled relation. The piston rod 12 terminates in a head 21 for engaging the inner end of the sleeve 16 to Cexpedite the-removalof the piston from the barrel 5. l

The opposite end of the barrel terminates 10o in a tubular extension 2,2. A sleeve 23 eX- tends through the tubular extension 22 and is provided, adjacent its inner end, with an annular rib 24 :for engaging the outer end of f the tubular member 2 2'.- A nut 25 is thread.-v ed upon the inner end of the sleeve 23 and-engages the adjacent end of the barrel 5 in such manner as to tightly clamp the sleeve 23 to the end ofthe barrel. The nut 25 comprises a bar 26, whichextends across .the inner end 23 and its inner end surrounds the outer end ofthe ,plunger 27. Ports 29, formed intermediate; the ends of the cylinder 28, provide means yfor establishing communication between the barrel 5 and the cylinder 28, it, of course, being understood that the lubricant passes from the barrel 5, around the bar 26 of the nut 25, into the sleev'e2'3- and from thence through the ports 29 into the high pressure cylinder. 'Ihe outer end of the bore of the cylinder 28 is enlarged to provide a valve seat 30 for the ball valve 31,"which is yieldingly held uponits seat by the compression spring 32. The outer end of this spring abuts against the cap 33, threaded upon the outer end of the cylinder 28. This cap terminates in a nipple 34, having the s herical end surface that is adapted to be rought yinto sealed contact with a lubricant receiving fitting, so that lubricant under pressure can be transferred from the compressor to the fitting.

A collar 36, threaded onto the cylinder 28, intermediate the ends of the latter, provides a stop for engaging the inturned flange 23',

of the sleeve 23, to limit the outward movement of the cylinder 28 relative tothe plunger 27. A gasket or piston 37, preferably formed of heavy leather, or other similar,

suitable material, surrounds the cylinder 28I and bears against the collar 36. A washer 38 also surrounds'the `cylinder 28 andcontacts with the gasket or piston 37. For yieldingly l Y urging the cylinder 28 outwardly, I provide the compression spring 39, which is confined between the washer 38 and the nut 25.

v In operating my improved compressor ]ust described, the operator first removes the cap 6 ,arid with it the piston rod 12 and the piston P, and thereupon substantially fills the barrel 5 and the cylinder 23 with lubricant. The

piston P is rotated until it is substantially in contact with the disk 14, vand ythen it and the cap 6 are replaced upon the barrel. The operatorl then turns the wing nut or handle 11 in a direction to cause the piston P to vtend to move inwardly. As soon as this piston firmly engages the lubricant in the barrel 5, its in- A'Ward movement will be arrested and continued rotation of the handle 11 ,will causethe' istomrod to move outwardly, thereby placmg the spring l5 under compresslon.

operator then places the end of the nipipleB/ 'in contact with a lubricant receiving tting and by exerting a pressure'upon the handle 8, substantially in the direction of the fitting, causes the cylinder 28 to move inwardly into the sleeve 23. The initialmovement uof the cylinder 28 causes the plunger 27 to close the ports 29 and further movement of these two elements, relatively to eachother, causes the The contents of the cylinder 28 to be placed under cylinder under the action of the piston P and the tension ofthe spring 15. .In this manner,

-hc can continue to discharge lubricant from the compressor until the spring 15 has eX- panded to substantially the position shown in Figure 1, whereupon he again rotates the wing nut or handle 11 to bring the spring 15 under tension. l i Y It will, of course,be understood that inthe yconstruction just described the pressure exerted uponthe lubricant `by the the spring 15 is exerted upon t e piston or gasket 37, in addition to the tension of the Spring 39. If the spring 15 is made sufliciently heavy, the spring 39 can be entirely omitted, this being the construction illustrated in Figure 2. When the construction of myimproved compressor is thus modified, the cylinder 2,8 will act as an indicator to indicate to the operator when the spring 15 requires retensioning, for if this spring is no longer able to place pressure upon the lubricant in the barrel' 5, the cylinder 28 will not return to the position shown in Figure 1 after it has been forced into the sleeve 23. As soon, however, as the operator turns the handle 11 and places the lspring 15 under compression, the pressure exerted upon the lubricant will act against the piston 37 and force the cylinder 28 outwardly. "y While I have described struction of the preferred embodiment of my invention, lit is to be clearly understood that my invention is not limited to these details, but is capable of other adaptations and modifications within the scope of the appended' claims.

Having thus described my invention, what- I claim is:

1. A lubricant compressor, comprising a barrel having an elongated removable cap at one end and a tubular extension at its other end, a piston rod recip'rocably mounted in said cap, a sprlng for urging said piston rod inpliston P and the details of conl lfifc wardly, a piston threaded onto said piston ed onto the inner end of said sleeve and eni gaging the end of said barrel, said nut comprislng a bar extendmg across the inner end of said sleeve, a cylinder reciprocably mountp ed at the outer end of saidsleeve, a plstgn carried by said cylinder, and a spring confined between said bar and said piston. Y 2. A lubrlcant compressor, comprising asaid c insane' barrel having a removable cap at one end and a tubular extension at its 'other end, a piston rod reciprocably mounted in said cap, a spring for urging said piston rod inwardly, a piston threaded onto said piston rod, a sleeve extending through said tubular extension, a nut threaded onto the inner endort said sleeve and engaging the end of said barrel, said nut Icomprising a bar extending across the inner end of said sleeve, a/cylinder reciprocably mounted at the outer end ot said sleeve, a piston carried by said cylinder, and a spring confined between said bar and said piston.

3. A lubricant compressor, comprising a barrel having a removable cap at one end, a piston rod, reciprocably mounted in said cap,

a spring for vurging said piston rod inwardly,

a piston threaded onto said piston rod, a sleeve communicating with said barrel, a cylinder reciprocably mounted at the outer end of said sleeve, a piston carried by said cylinder, and a spring confined between said piston and an abutment rigid with said barrel. i

4. A lubricant compressor, comprising a barrel having a closure at one end, -a piston rod reeiprocably mounted in said closure, a spring for urging 'said piston rod inwardly, a piston threaded onto said piston rod, a sleeve communicating with said barrel, a cylinderv reciprocably mounted in the outer end of said sleeve and communicating with said sleeve, a plunger carried by said barrel `for discharging the contents of said cylinder, and a piston surrounding saidcylinder and reciprocably mounted in said sleeve.

5. A lubricant compressor, comprising a barrel, spring means in said barrel for placing the lubricant therein under pressure, a` barrel, a-

sleeve communcatingwith said cylinder reciprocably mounted11n said sleeve and communicating therewith, a piston carriedby said cylinder and subjected to the pressure of the lubricant in said sleeve, and

a plunger for expelling the lubricant from inde-r.

barrel and reciprocable relatively thereto, a plniiger for expelling the lubricant from said cylinder, and common means for placing the lubricant in said barrel under pressure'a'nd for moving said cylinder to its outermost position.

7. A barrel, a eyl;.n`der communicating t erewlth, a plunger for discharging the lubricant from said cylinder, and common means for discharging the lubricant from said barrel into said cylinder and for indicating to the operator when said compressor is in operative condition. j

8. A lubricant compressor, comprising a lubricant compressor, comprising av barrel, a cylinder communicating with saldA barrel, a cylinder communicating therewith, a plunger for discharging the lubricant from said cylinder, and common means for forcing lubricant from said barrel into said cylinder and for holding said. barrel and cylinder in 'such relative positions as lto permit said cylinder to be recharged from said barrel.

9. A lubricant compressor, comprising a barrel, having a tubular extension at one end, a sleeve4 extending through said tubular extension and provided with an annular rib engaging the outer end of said tubular exten.- sion, a nut threaded upon'the inner end of 'said sleeve and engaging the adjacent end of the barrel for clamping said sleeve,to said barrel, and lubricant compressing mechanismhoused in said sleeve.

10. A grease gun comprising a cylinder, a second cylinder communicating therewith and disposed in end to end relation at one end of the first cylinder, externally thereof, a tube having an annular piston formed therearound and disposed within the second cylinder, a plunger in said second cylinder movable into the tube as said tube is moved into the cylinder, and a spring for moving the tube out of said cylinder, said tubular member having radial openings locatedbetween said piston and said plunger and communieating with said second cylinder when the ,i tube l1s in its outer position.

11. vA grease gun comprising a cylinder. a second ycylinder communicating therewith l and disposed in end to end relation at'one end of the first cylinder, externally thereof,

a tube vhaving an annular pistonA formed therearound and disposed within the second plunger in said second cylinder movable into cylinder, substantially filling said cylinder. a

the tube as said tube and .piston are moved l into the cylinder, and a spring for movingthe tube and piston out of said cylinder.

12. A grease gun comprising a cylinder,a V

Charge of grease from said second cylinder into said tube. 13. A grease gun comprising a cylinder,

a second cylinder communicating therewith in end to end relation, a tube communicating with said secondV cylinder, means to draw a p vcharge of grease from said first cylinder into lubricant compressor, com rising a` 'my name this 29th day oflApril,.1924.

nanas-'r w. Davis. 

